I have about 208,000 miles on my vehicle listed above, and I have flushed the automatic transmission exactly once. I estimate about 10 years and 80,000 miles ago. I've attached a picture of what it looks like now. There's a tiny bit of black carbon from the bottom of the dipstick, otherwise it's a little dark but still quite reddish, not totally burned by any means. My car has started shifting a bit hard or slipping a bit when going from 3rd to 4th gear (I think) around 40 mph or so. I noticed the dipstick reads at just above (or at) the lower hot line when warmed up. What would you recommend I do at this time? Topping it up to halfway between the bottom and top hot lines and seeing if there's any change in symptoms seems logical. What about using a product like Stop Slip in lieu of normal transmission fluid?
Technically I'm definitely due for a transmission flush. But I've heard that can actually make the problem worse on high mileage vehicles. Although it sounds like that's mostly if the fluid is burnt and full of metal shavings. Please advise on whether it's best to flush, drain/fill (which only replaces about half the fluid I've heard), or just top it up and leave it alone for now. Personally I don't like the idea of driving it as is until the transmission stops working.
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Tuesday, May 26th, 2020 AT 1:40 PM